<div dir="ltr"><div>Thank you Richard. That was my thought originally based on the behavior I was seeing, but I hadn't taken one apart to try to find the coin battery. And Outback tech support told me there was no such thing....</div><div><br></div><div>And regarding Ray's comment about the Mate3 -- as far as I know, yes, that's the only way to program the FM100. I do find it kind of ironic that people (myself included) hated buying an extra programming controller for inverters and charge controllers when Outback/schneider/magnum all went that way about 15 years ago. But then when Midnite Power introduces an inverter you program completely with a phone app instead of requiring you to buy a separate programmer, there is so much complaining that they are now introducing a separate programming controller for it.</div><div><br></div><div>Zeke</div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">On Sat, Apr 11, 2026, 8:51?AM Richard Nicol via RE-wrenches <<br><a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br><br></div><div dir="ltr"><br>
> Reviving an older topic with a new learning regarding FM100 resetting to<br>
> defaults after a shutdown event.<br>
> Memory is battery dependent rather than solid state.<br>
> There is a button cell battery (2032), on the circuit board attached to<br>
> the lid, with the leds on it. Three phillips screws hold it in place.<br>
> Apparently Outback knows they have had batches of these batteries.<br>
> [image: image0.jpeg][image: image1.jpeg]<br>
> Sent from my iPhone</div><br><div class="gmail_quote gmail_quote_container"><br></div></div>